From f59ea26941ba53a0ee02406787cb8800c2ca53dc Mon Sep 17 00:00:00 2001
From: dauTT <dautruongtan@gmail.com>
Date: Sat, 18 Jul 2020 19:23:37 +0200
Subject: [PATCH] Merge PR #6774: x/auth/simulation/params.go: add unit tests

---
 x/auth/simulation/params_test.go | 37 ++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 x/auth/simulation/params_test.go

diff --git a/x/auth/simulation/params_test.go b/x/auth/simulation/params_test.go
new file mode 100644
index 0000000000..b8fb384a80
--- /dev/null
+++ b/x/auth/simulation/params_test.go
@@ -0,0 +1,37 @@
+package simulation_test
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/cosmos/cosmos-sdk/x/auth/simulation"
+)
+
+func TestParamChanges(t *testing.T) {
+	s := rand.NewSource(1)
+	r := rand.New(s)
+
+	expected := []struct {
+		composedKey string
+		key         string
+		simValue    string
+		subspace    string
+	}{
+		{"auth/MaxMemoCharacters", "MaxMemoCharacters", "\"181\"", "auth"},
+		{"auth/TxSigLimit", "TxSigLimit", "\"7\"", "auth"},
+		{"auth/TxSizeCostPerByte", "TxSizeCostPerByte", "\"12\"", "auth"},
+	}
+
+	paramChanges := simulation.ParamChanges(r)
+
+	require.Len(t, paramChanges, 3)
+
+	for i, p := range paramChanges {
+		require.Equal(t, expected[i].composedKey, p.ComposedKey())
+		require.Equal(t, expected[i].key, p.Key())
+		require.Equal(t, expected[i].simValue, p.SimValue()(r))
+		require.Equal(t, expected[i].subspace, p.Subspace())
+	}
+}